Mixtures and pure substances

1. PURE SUBSTANCES AND
MIXTURES
Natural Science 4th of Primary

2. PURE SUBSTANCE
 A pure substance is formed only by
one substance.
Example: water, salt

3. MIXTURES
 A mixture is something formed by two
or more substances
 There are two kinds of mixtures
◦ HOMOGENEOUS MIXTURES
◦ HETEROGENEOUS MIXTURES

4. HOMOGENEOUS MIXTURE
 In this kind of mixture, you can’t
distinguish the components
 Examples:
Puree Coffee Milkshake
Chocolate Cold tomato soup Orange juice

5. HETEROGENEOUS
MIXTURE
 In this kind of mixture, you can
distinguish all the components
 Examples:
Salad Fruit salad
Paella
Milk and cereals Chickpeas

6. STATES OF MATTER

7. QUESTIONS
 What’s the name of a substance formed
only by one component?
 What’s the name of a subtance formed
by two substances in which you can
distinguish them?
 Is milkshake a homogeneous or a
heterogeneous mixture?
 Is paella a homogeneous or a
heterogeneous mixture?
 Is salad a homogeneous or a
heterogeneous mixture?

8. ACTIVITIES
1. Classify these substances in
mixtures or pure substances.
2. Classify these mixtures in
homogeneous or heterogeneous
GOLD – SALAD – ORANGE JUICE – WATER – CHOCOLATE –
SALT -
MILKSHAKE – CHOCOLATE – FRUIT SALAD - COLD TOMATO
SOUP – ORANGE JUICE – SALAD – PAELLA – PUREE - COFFEE

9. ACTIVITIES
Write the name of the state change
SOLID LIQUID GAS

10. JOURNAL
 Write and draw three examples of
heterogeneous mixture and three of
homogeneous mixture.